A substance, such as platinum, silver, or nickel, from which the electrodes of a fuel cell are made, and which speeds the reaction of the cell; it is especially important in a fuel which does not operate at high temperatures.

Those forms of the sugars which contain a ring of 4 carbons and oxygen and in contrast with the pyranose sugars are characterized by their instability. They exist in a and b forms, but the sugars themselves have not been obtained crystalline; they have to be converted into ethylglycosides for crystallisation.

Gadolinium
Refers to a ductile malleable silvery element of the lanthanoid series of metals. It occurs in association with other lanthanoids. Gadolinium is used in alloys, magnets, and in the electronics industry. Symbol: Gd; m.p. 13130C; b.p. 3266°C; r.d. 7.9. p.n. 64; r.a.m. 157.25.